Add fast track window animations.

The enter animation works; the exit animation doesn't, because of the
associated with the activity.  In theory I have a dummy animation
also associated with the activity to keep it around during the exit
animation, but this isn't working and I need to figure out why.

Change-Id: I1a3a3e4832e62080c35b4bc8f888bdc2d90528c8
diff --git a/res/anim/fasttrack_below_exit.xml b/res/anim/fasttrack_below_exit.xml
new file mode 100644
index 0000000..7587c7a
--- /dev/null
+++ b/res/anim/fasttrack_below_exit.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+** Copyright 2009, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+-->
+
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+        android:interpolator="@android:anim/accelerate_interpolator">
+    <scale android:fromXScale="1.0" android:toXScale=".5"
+            android:fromYScale="1.0" android:toYScale=".5"
+            android:pivotX="50%" android:pivotY="0%"
+            android:duration="@android:integer/config_shortAnimTime" />
+    <alpha android:fromAlpha="1.0" android:toAlpha="0"
+            android:duration="@android:integer/config_shortAnimTime" />
+</set>